AstronomyUkraine Posted June 12, 2021 Share Posted June 12, 2021 After reading a few articles by members on here regarding widefield imaging, a germ of an idea popped into my head. I have at my disposal several Canon EOS L series lenses that I use for wildlife imaging. As anyone who has been into photography for any length of time knows, the L series lenses are high quality. The one I want to use is my 100 - 400 L IS USM. It is not extremely fast like the Samyang lens other members are using, but it is still a respectable f4.5, with a 77mm filter size. My plan is to buy a ZWO-EFW-EOS-II adapter which will allow me to connect my EFW to the Canon lens, autofocus won't be an option, but I can use a Bahtinov mask, and the focusing mechanism on the lens is very good, allowing fine adjustments. The only problem I can see is platesolving and finding the focus point, but this adapter is specially made for Canon cameras to operate with the EFW and the 1600 which I use. So hopefully the focusing shouldn't be a problem. The 100 - 400 lens also has a built in tripod mount, so bolting it down to a dovetail won't be a problem. If I have overlooked anything, or anyone has any experience using this type of lens for astro imaging, let me know your thoughts. Brian Quote Link to comment Share on other sites More sharing options...
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